Door-check.



Patented 1an. 7 i902.

F. J. MiLLE. D003 CHECK. Applicgtion md .my 23, 11901..)

(N0 Model.)

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UNITED STATES PATENT OFFICE.

FRANQISJ. MILLER, on WASHINGTON, DISTRICT or COLUMBIA.

DOOR-CHECK.

SPECIFICATION 'forming part of Letters Patent No. 690,600, dated January 7, 1902.

IApplication led July 23, 1901. l Serial No. 69,430. @To model.) l

.To all whom t may con/@erm Be it known that I, .FRANCIS J. MILLER, a citizen of the United States, residing at 1627 Rosedale street northeast, Washington, in the District of Columbia, have invented new and useful Improvements in Door-Checks, of which the following is a specification.

My invention relates to door-checks, the object being to provide a simple and inexpensive device for securing a door in any desired-position, the device being operated automatically bythe turning of the door-knob spindle. Y

A further object of the invention is to provide a device of the character `named which may be adjusted to adapt it to doors of vary- In the drawings, Figure 1 is a front eleva-' tion of a door-check embodying the invention applied to the spindle of a door-knob. Fig. 2 is a side elevation of the same, and

Fig. 3 is a longitudinal section of the device.v

The reference-numeral 1 designates a tube externally.screw-threaded at its lower end 2V to iit a socket 3, carrying a friction device,

preferably consisting 'of a rubber sphere 4:.v

Within the tube lis a rod 5, whichis adjustably secured by a set-screw 6, located at the .upper end of the tube 1.

The upper end 7 of the rod 5 is flattened and formed with a perforation to adapt it to be pivotally secured to the lower end of a crank-arm S. This crank-arm preferably consists of two independent metallic straps 9 and 10, pivotally secured at their lower ends to the upper end of the rod and twisted and outwardly curved to form clamping-jaws 11, which embrace the spindle l2 of the doorknob and are clamped thereon by means of a bolt 13 and a nut 141:. The inner surfaces `of the clampingjaws are roughened or serrated, as shown at 14a.

15 designates a bracket of approximately semicircular form adapted to be securedby screws 16 or equivalent means to the` door and formed with acentral internally-threaded opening 17 to receive the threaded stem 18 of a screw-eye 19p.` The tube 1 extends f through the screw-eye 19, and said screw-eye serves as a stop for the lower end of a coilspring 20, which surrounds the tube 1, the

upper end of said spring being held bya clamp 2l,surrounding the tube l and provided v .f

with a perforated extension 22, into which the upper end of the spring projects.

The tubelis adapted to playloosely through the screw-eye 19 and to'have a pivotal connection to the door thereby, and the tendency of the spring 2O is to project the tube down.-

with the floor.

The'utility and operation of the device constructed as thus described will be readily understood. Normally the spring 20 forces the ball 4 intoA frictional contact with vthe licor, thus holding the door at any desired position.

To release the door, it is onlynecessary to-turn the knob so that thecrank-arm 8 will elevate .the tube 1, as illustrated in dotted'lines in Fig. 1, thus releasing the ball 4from contact with thefloor and permitting the doorto be closed. By loosening the'clamp 21 and moving the tube 1 upward thespringbecomes in- L, 1 l.

operative and the friction-ball will not bear upon the floor.

Having thus fully describedmy invention, Il' what I claim' as new, and desire to secure by y Letters` Patent, is-

1. A door-check comprising telescopic merni bers having a slidable and pivotalconnection to the door a frictional device-carried there-y by; and a crank-arm secured tothedoor-knob j I spindle and having apivotal connection with one of said telescopingmembers.

2. A door-check comprising a tube; a rod arranged therein; means for adj ustably securing the rod within the tube; a crank-arm having a pivotal connection with the upper end of the rod and secured to the door-knob spinydle; a bracket'adapted to be secured to the door; a .clamp embracing the tube; and a spring surrounding the tube and attached at its respective ends to said clamp and bracket.

3. VA door-check comprising a tube externally threaded atits'lower end and having a j slidable and pivotal 'connection to the door; an internally-threaded socket carryinga frictiont ball; a rod adjustably supported within the 6s' ward to force the friction-ball into contact f tube; a crank-arm pivotally secured to the upper end of said rod and secured upon the door-knob spindle; and a spring surrounding the tube for projecting the latter downward. 4. A door-check comprising a tube; a socket at the lower en d thereof; a friction device within said socket; a rod adj ustably secured within the tube; a bracket adapted to be securedto the door a screw-eye supported by said bracket through which the tube extends; a clamp surrounding the tube; a coil-spring surrounding the tube and attached at its rel spective ends to the clamp and screw-eye; and a crank-arm pivotally secured to the upper end of said rod and comprising metallic straps twisted and curved to form clampingjaws which embrace the door-knob spindle.

In testimony whereof I affix my signature in presence of two Witnesses.

FRANCIS J. MILLER.

Witnesses:

GEO. E. FRECH, HARRY SCHMIDT. 

